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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '471aeeb70cb845124b3f688361cdc32f1ccc54c366e7187a7aa3e76b57aea89d' 
  AND token = 'BXjNH2VYI70xkf5EZQ0fXuTiNFd3vjNiQ2ESUFdOx40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}